Positive fecal occult blood is not necessarily a problem, it can be a physiological change or it can be caused by a disease. Positive fecal occult blood indicates that red blood cells were found during the stool examination and the stool was laced with blood. However, if the patient consumes animal blood such as pig’s blood, chicken’s blood, duck’s blood, etc. before the examination, it is easy to cause a false-positive fecal occult blood, which is physiological and not a problem. If the patient has no recent history of eating or drinking the foods mentioned above, a positive fecal occult blood test may indicate the presence of gastrointestinal bleeding disorders. Common diseases that can cause gastrointestinal bleeding include gastric ulcer, duodenal ulcer, acute and chronic enteritis, gastric cancer, intestinal cancer, etc. Further examination should be conducted to clarify the cause of the disease and active treatment should be carried out. In conclusion, positive fecal occult blood does not necessarily mean that there is a problem, and it is necessary to combine with dietary history and other tests to clarify the specific causes under the guidance of the doctor.